Drugs like cocaine and even marijuana and nicotine affect the brainâs natural function. The drug overwhelms the brain with a chemical called dopamine. Dopamine makes the brain and body feel pleasure. When the drug wears off, the dopamine drains out of the userâs system. This makes a person feel that the only way they can feel pleasure is by taking drugs.
March 31, 2015. Apple uses its own signature operating system, which since 2001 has been derived from Unix and known as OS X. Before OS X came OS 9, otherwise known as Classic.. As of June 2014, the latest version of OS X is called Mavericks..
Mac OS X - Produced by Apple, Mac OS X is the operating system used on Macintosh computers. Although it uses a different GUI, it is conceptually similar to the Windows interface in the way it operates. Linux and other UNIX-derived operating systems - Linux and other systems derived from the UNIX operating system are frequently used for specialized workstations and servers, such as web and email servers.